captions - captions break if the vvt loaded contains a cue that has a forward slash in its text

[bcupac]

Have you read the FAQ and checked for duplicate open issues?

What version of Shaka Player are you using?
3.2.0

Can you reproduce the issue with our latest release version?
yes

Can you reproduce the issue with the latest code from master?
yes

Are you using the demo app or your own custom app?
demo

If custom app, can you reproduce the issue using our demo app?

What browser and OS are you using?
chrome/macOS

For embedded devices (smart TVs, etc.), what model and firmware version are you using?

What are the manifest and license server URIs?

What configuration are you using? What is the output of player.getConfiguration()?

What did you do?

load a VTT file that contains a cue that has a forward slash(/) in its text

What did you expect to happen?
caption track would load and cues would show up

What actually happened?

an exception is thrown and captions break entirely